電腦圖學 week06

 1.##期中考題目練習

2.##week06-0_sample_code

##總共20+2行程式碼

const GLfloat light_ambient[]  = { 0.0f, 0.0f, 0.0f, 1.0f };

const GLfloat light_diffuse[]  = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat light_position[] = { 2.0f, 5.0f, 5.0f, 0.0f };

const GLfloat mat_ambient[]    = { 0.7f, 0.7f, 0.7f, 1.0f };

const GLfloat mat_diffuse[]    = { 0.8f, 0.8f, 0.8f, 1.0f };

const GLfloat mat_specular[]   = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat high_shininess[] = { 100.0f };

glEnable(GL_DEPTH_TEST);

    glDepthFunc(GL_LESS);

glEnable(GL_LIGHT0);

    glEnable(GL_NORMALIZE);

    glEnable(GL_COLOR_MATERIAL);

    glEnable(GL_LIGHTING);

    glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);

    glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);

    glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);

    glLightfv(GL_LIGHT0, GL_POSITION, light_position);

    glMaterialfv(GL_FRONT, GL_AMBIENT,   mat_ambient);

    glMaterialfv(GL_FRONT, GL_DIFFUSE,   mat_diffuse);

    glMaterialfv(GL_FRONT, GL_SPECULAR,  mat_specular);

    glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);

3.##下載課本範例

到https://jsyeh.org/3dcg10/ 

下載win32 跟data、source三個檔案

在下載的資料夾，把windows.zip =>windows資料夾

       把data.zip裡面的data拉到下載\windows資料夾裡

4.##week06-2_lighting_glNormal3f

#include <GL/glut.h>

float angle = 0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(angle++, 0, 1, 0);

        glScalef(0.8, 0.8, 0.8);

        glBegin(GL_POLYGON);

            glNormal3f(0,0,1);

            glVertex2f(-1,-1);

            glVertex2f(+1,-1);

            glVertex2f(+1,+1);

            glVertex2f(-1,+1);

        glEnd();

    glPopMatrix();

    glutSwapBuffers();

}

///貼這裡 打光相關陣列 8行

const GLfloat light_ambient[]  = { 0.0f, 0.0f, 0.0f, 1.0f };

const GLfloat light_diffuse[]  = { 8.0f, 1.0f, 8.0f, 1.0f };

const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat light_position[] = { 2.0f, 5.0f, -5.0f, 0.0f };

const GLfloat mat_ambient[]    = { 0.7f, 0.7f, 0.7f, 1.0f };

const GLfloat mat_diffuse[]    = { 0.8f, 0.8f, 0.8f, 1.0f };

const GLfloat mat_specular[]   = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat high_shininess[] = { 100.0f };

int main(int argc, char *argv[])

{

    glutInit( &argc, argv );

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week06-1 lighting");

    glutDisplayFunc(display);

    glutIdleFunc(display);

///貼這裡 打光相關的函式呼叫 2+12行

    glEnable(GL_DEPTH_TEST);

    glDepthFunc(GL_LESS);

    glEnable(GL_LIGHT0);

    glEnable(GL_NORMALIZE);

    glEnable(GL_COLOR_MATERIAL);

    glEnable(GL_LIGHTING);

    glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);

    glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);

    glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);

    glLightfv(GL_LIGHT0, GL_POSITION, light_position);

    glMaterialfv(GL_FRONT, GL_AMBIENT,   mat_ambient);

    glMaterialfv(GL_FRONT, GL_DIFFUSE,   mat_diffuse);

    glMaterialfv(GL_FRONT, GL_SPECULAR,  mat_specular);

    glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);

    glutMainLoop();

}

5.##week06-3_glm_obj_model

1.把11行程式GLUT先做出來
2.參考 source.zip 裡面的 transformation.c 
3.1 #include "glm.h"
3.2 GLMmodel * pmodel = NULL;
3.3 讀模型，畫模型 void drawmodel(void) 這個函式
4.檔案準備好：
4.1.glm.h 放到 week06-3_glm_obj_model 目錄裡
4.2.glm.c 放到 week06-3_glm_obj_model 目錄裡，改檔名 glm.cpp
4.3.專案，按右鍵，新增檔案，將 glm.cpp 加入專案
4.4.將 data 資料夾，複製到桌面 \freeglut\bin 執行目錄裡

4.5.把 glutSolidTeapot(0.3); 換成 drawmodel();

#include <GL/glut.h>

#include "glm.h"

GLMmodel * pmodel = NULL;

void drawmodel(void)

{

    if (!pmodel) {

pmodel = glmReadOBJ("data/porsche.obj");

if (!pmodel) exit(0);

glmUnitize(pmodel);

glmFacetNormals(pmodel);

glmVertexNormals(pmodel, 90.0);

    }

    glmDraw(pmodel, GLM_SMOOTH | GLM_MATERIAL);

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    drawmodel(); ///glutSolidTeapot( 0.3 );

    glutSwapBuffers();

}

int main(int argc, char *argv[])

{

    glutInit( &argc, argv );

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week06 glm obj model");

    glutDisplayFunc(display);

    glutMainLoop();

}